Surge Protective Devices Onboard Vessels

MarineLink.com
Monday, April 08, 2013

Surge protective devices (SPDs), more commonly known as surge protectors or power strips, help protect electronic devices from being damaged from excessive currents and allow the delivery of power to multiple devices simultaneously. This safety alert addresses the use of certain electrical protection devices onboard vessels and the inherent risks they may cause. Most commercially available SPDs are designed for use ashore and will interrupt only the hot conductor when a surge occurs. What does that mean for the ship owner/operator? It means that while these devices may provide protection in our homes and offices, these same devices may be fire risks onboard vessels.

A marine casualty investigation of two separate stateroom fires onboard a U.S. Flag Container ship revealed that the sources of the fires were attributed to the use of SPDs plugged into a lighting circuit. It was discovered that a ground had developed on another circuit that was connected to the same distribution panel providing power to the staterooms. This ground created an imbalance of voltage between the two power conductors supplying the SPDs which caused excessive currents, overheating, and subsequently, a fire. In this instance, even if the SPDs automatically tripped as designed, only one power conductor would have been secured while the other would continue to provide power, possibly shorting to the device's ground wire and the structure of the vessel.

For shipboard applications, it is critical for a device to interrupt both power conductors. Underwriters Lab Standard - UL Marine 1449 - addresses this issue and applies to the use of SPDs.

The Coast Guard recommends that vessel Owners, Operators, Class Society Surveyors, Insurers, and other inspection personnel examine the risks associated with the use of SPDs aboard their vessels, and if necessary ensure their organizations have policies and procedures relating to their use.  Vessels should have defined procedures for checking the condition and grounding capabilities of personal/portable electrical equipment, and trained shipboard personnel should be assigned to check and approve all SPDs in use or brought on board for compatibility with the vessel's electrical distribution system prior to use. Routine checks of switchboard and distribution system 120 VAC ground detection systems are necessary to detect the presence of grounds that may cause similar circumstances with non-marine type SPDs. These recommendations are not mandated, rather just an advisory based on lessons learned from the casualty.

www.marineinvestigations.us
 

Maritime Reporter August 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Marine Electronics

NavStation to Launch at SMM

Touch screen technology has transformed everyday life and now, thanks to Norwegian e-navigation specialist NAVTOR, it is set to revolutionize operations onboard busy vessel bridges.

Imtech Marine Nav/Com Partner for Groen OSV

The first newbuild ship in a series of three offshore support vessels (OSVS) for shipowner Groen (Scheveningen), 7-Oceans, was delivered at Damen Maaskant Shipyards in Stellendam,

MN 100: FloScan Instrument Co., Inc.

3016 NE Blakeley Street Seattle, WA 98105 Telephone: 206 524 6625 / 316 E-mail: joe.dydasco@floscan.com Website: www.floscan.com CEO/President: Chuck Wurster Number

Maritime Safety

Tropical Storm Dolly Heads toward Mexico

NOAA's National Hurricane Center issued a tropical storm warning in effect from Cabo Rojo to Barra El Mezquital, Mexico as Tropical Storm Dolly approaches the country’s eastern coast.

Master Fined After Wind Farm Collision

The master of a wind farm support vessel has today been made to pay £3,000 in fines and costs after pleading guilty to breaches of maritime collision regulations.

Challenging the Myths of Pirate Violence

“In the last five years, pirates have killed at least 411 fishermen and wounded at least 1,000 more, suggested Mujibur Rahman, Chairman of Cox’s Bazar District

 
 
Maritime Careers / Shipboard Positions Maritime Standards Naval Architecture Navigation Pipelines Pod Propulsion Port Authority Ship Electronics Ship Simulators Shipbuilding / Vessel Construction
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1037 sec (10 req/sec)